Photovoltaic technology becomes worldwide extension hot research topic and more development is still needed especially in case of increasing its efficiency and decreasing its costs per kilowatt. However,  the performance of PV modules is highly influenced by weather conditions, where high ambient temperature is the most important factor that affects efficiency of the photovoltaic solar cells

This paper aims to study and characterize the efficiency of the photovoltaic solar cells during the hours of the day in the extremely hot regions. Moreover, it explains the relationships among the efficiency of the PV with solar radiation and ambient temperature. On the other hand, it is proposed to use a layer of copper sulphate solution (CSS) in front side of the PV cell at different concentrations to improve its efficiency